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Search: id:A126466
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| 1, 1, 3, 33, 855, 40475, 3039204, 331630320, 49563943161, 9722245517970, 2423526680920125, 748560249534719259, 280702726068079355157, 125661789748507921799800, 66215986172320048509110050
(list; graph; listen)
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OFFSET
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0,3
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PROGRAM
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(PARI) {a(n)=local(M=matrix(n+1, n+1, r, c, if(r>=c, binomial((r-1)*r*(r+1)/3!-(c-1)*c*(c+1)/3!, r-c))), N=matrix(n+1, n+1, r, c, if(r>=c, binomial((r-1)*r*(r+1)/3!-(c-1)*c*(c+1)/3!+1, r-c)))); (N*M^-1)[n+1, 1]}
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CROSSREFS
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Cf. A126465, A126467, A126468; A126469 (row sums).
Adjacent sequences: A126463 A126464 A126465 this_sequence A126467 A126468 A126469
Sequence in context: A003715 A009690 A124432 this_sequence A002112 A055549 A086894
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Dec 27 2006
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